/usr/lib/x86_64-linux-gnu/libjsonrpccpp-stub.so is in libjsonrpccpp-dev 0.7.0-1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libjsonrpccpp-stub.so.0
/usr/lib/x86_64-linux-gnu/libjsonrpccpp-stub.so.0